Set[@@species]
访问器属性返回Set
的构造函数.
Set[Symbol.species]
species 访问属性返回 Set
对象的默认构造函数. 子构造函数或许会重载这个属性以至改变构造函数的赋值.
species 属性返回默认的构造函数, 它是Set
对象的构造函数:
Set[Symbol.species]; // function Set()
在一个派生集合对象中 (比如你自定义的MySet
集合), MySet
的species 属性 是 MySet
构造函数. 又或者, 你想要重写它, 让它能在你派生的类方法中能返回父级Set
对象:
class MySet extends Set { // Overwrite MySet species to the parent Set constructor static get [Symbol.species]() { return Set; } }
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) get Set [ @@species ] |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) get Set [ @@species ] |
Draft |
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
@@species | Chrome Full support 51 | Edge Full support 13 | Firefox Full support 41 | IE No support No | Opera Full support 38 | Safari Full support 10 | WebView Android Full support 51 | Chrome Android Full support 51 | Edge Mobile Full support 13 | Firefox Android Full support 41 | Opera Android Full support 38 | Safari iOS Full support 10 | Samsung Internet Android Full support 5.0 | nodejs
Full support
6.5.0
|